The Quattro-15 lower receiver accepts the Quadmag-53″ Desert Tech’s 53 round magazine and standard AR pattern mags. The Quattro-15 lower receiver is drop in capable with all standard AR-15 upper receivers.
Desert Tech Quattro-15, Semi-automatic, Lower Receiver, AR-15, 223 Remington/556NATO, Black, Accepts Quadmag-53 and Standard AR magazines QTR-LR-15
